<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Throw语句</title>
</head>

<body>
    <p>请输出一个 5 到 10 之间的数字:</p>
    <input id="demo" type="text">
    <button type="button" onclick="myFunction()">测试输入</button>
    <p id="message"></p>
    <script>
        function myFunction() {
            var message, x;
            message = document.getElementById("message");
            message.innerHTML = "";
            x = document.getElementById("demo").value;
            try {
                if (x == "") throw "值为空";
                if (isNaN(x)) throw "不是数字";
                x = Number(x);
                if (x < 5) throw "太小";
                if (x > 10) throw "太大";
            }
            catch (err) {
                message.innerHTML = "错误: " + err;
            }
        }
    </script>
</body>

</html>